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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 07, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Goodwill [Line Items] |  |  |  |
Goodwill | $ 1,566,524 |  | $ 1,002,900 | $ 1,002,900
Core deposit and other intangibles | 171,637 |  | $ 49,816 | $ 53,083
CSFL |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 563,600 | $ 563,625 |  |
Goodwill related to the CSFL merger | 563,600 |  |  |
Core Deposits | CSFL |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets related to the CSFL merger | 125,900 |  |  |
Client list intangibles | CSFL |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets related to the CSFL merger | $ 10,000 |  |  |

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